RFC_ERROR_SYSTEM_FAILURE with SAP ECC6.0 Unicode

Hi All,
I am using BizTalk 2006 R2, Microsoft BizTalk Adapter v2.0 for mySAP Business Suite SP1 & SQL Server 2005 as a Database server.
In past we developed Orchestrations which were communicating with SAP version 4.7. Currently SAP has been upgraded in ECC 6(Unicode) system.
I have configured new Send Port on server. Orchestration was able to communicate with SAP ECC 6.0 (Non- Unicode) system but while trying to connect with SAP ECC 6.0 (Unicode) I am getting error.
A message sent to adapter "SAP" on send port "ECC 6 SendPort" with URI "sap://AS:***.**.***.***/**/***/" is suspended.
Error details: RFC_ERROR_SYSTEM_FAILURE
I also installed RFC SDK 7.10 Unicode version an also set environment variables for SAP GUI tracing. Now I can execute RFC which returns CHAR value but in case of NUM data type, I am getting following error in trace file,

T:4012 Error in program 'BTSNTSvc':
>> ERROR: Import parameter length difference detected.
Read length: 7. Expected length: 0. Type: 2.

T:4012 Error in program 'BTSNTSvc': <* RfcReceive [2] : returns 19:RFC_INVALID_PARAMETER
T:4012 Error in program 'BTSNTSvc': <* RfcCallReceive [2] : returns 19:RFC_INVALID_PARAMETER
T:4012 Error in program 'BTSNTSvc': <* RfcCleanupContext [2] : returns 18:RFC_INVALID_HANDLE
T:4012 Error in program 'BTSNTSvc': <* RfcCleanupContext [2] : returns 18:RFC_INVALID_HANDLE


Thanks in advance.